Battery pack and energy storage device

Abstract

The application provides a battery pack and an energy storage device, and belongs to the technical field of energy storage. The battery pack comprises a box body, a battery module, a power module and a limiting piece. The battery module is provided with a heating film. The power module is electrically connected with the battery module. The limiting piece is located between the battery module and the power module. The limiting piece is connected with the power module and abuts against the heating film. After the power module is fixed with the box body, the limiting piece can abut against the heating film arranged on the battery module. The structure enables the heating film to be pre-pressed and fixed during assembly, and positioning and connection can be achieved without completely relying on an adhesive. In this way, even if the adhesive used to connect the heating film and the battery module melts due to high temperature, the limiting piece can continuously apply pressure to the heating film through abutting action, preventing the heating film from falling off, so that the fitting state and heat conduction efficiency between the heating film and the battery module are effectively maintained.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and more particularly to a battery pack and energy storage device. Background Technology

[0002] With the continuous development of clean energy, energy storage systems have been widely applied in various fields. As a key component of energy storage systems, battery packs have undergone continuous research and development and innovation in recent years.

[0003] The battery pack includes a housing and battery modules housed within it. The electrochemical performance of the battery modules is highly sensitive to temperature; for example, they achieve their highest charge / discharge efficiency only within a specific operating temperature range. When the ambient temperature is low, the chemical reaction rate within the battery modules slows down, leading to a decrease in charge / discharge efficiency and consequently reducing the actual usable capacity of the battery pack. To address this, related technologies incorporate a heating film on the surface of the battery modules and use a specific adhesive to fix the heating film to the battery module surface, allowing for heating of the battery modules at low temperatures and maintaining their optimal operating temperature range.

[0004] However, the adhesive is prone to melting under high temperature conditions, which can cause the heating film to fail to stay in place or even fall off. Utility Model Content

[0005] This application provides a battery pack and energy storage device that can improve the reliability of heating film fixation.

[0006] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0007] In a first aspect, this application provides a battery pack, including a housing, a battery module, a power module, and a limiting member: the housing has a receiving cavity and a first opening communicating with the receiving cavity; the battery module is disposed in the receiving cavity, and a heating film is disposed on the side of the battery module facing the first opening; the power module is disposed in the first opening and is electrically connected to the battery module; the limiting member is located between the battery module and the power module, the limiting member is connected to the power module, and abuts against the heating film.

[0008] By setting a limiting member on the side of the power module facing the battery module and connecting the limiting member to the power module, after the power module is positioned and fixed in the first opening of the housing, the limiting member can abut against the heating film on the side of the battery module facing the first opening, i.e., the limiting member and the heating film are interference-fitted. This structure allows the heating film to be pre-pressed and fixed during assembly, eliminating the need to rely entirely on adhesives for positioning and connection. Thus, even under high-temperature conditions, causing the adhesive used to connect the heating film and the battery module to melt, the limiting member can still continuously apply pressure to the heating film through its abutting action, preventing the heating film from falling off. This effectively maintains the adhesion and heat conduction efficiency between the heating film and the battery module, avoiding safety accidents such as dry burning of the heating film, ignition of auxiliary materials, and short circuits caused by burning insulation materials. In addition, because the heating film is reliably fixed, it ensures that the battery module can heat up quickly and evenly in low-temperature environments, maintaining its operation within the optimal operating temperature range. Within this temperature range, the electrochemical reaction rate inside the battery module accelerates, and the charging and discharging efficiency is significantly improved, thereby increasing the actual usable capacity of the battery module. Meanwhile, the stable and fixed heating film also helps maintain the stability of the temperature and humidity environment inside the battery pack, reduces the risk of condensation on the surface of electronic components in the battery pack, avoids circuit failures such as short circuits caused by this, and significantly improves the overall safety of the battery pack.

[0009] In one feasible approach, the limiting element is an elastic limiting element.

[0010] After the power module is positioned and fixed in the first opening of the housing, the limiting component can undergo elastic deformation, thereby generating a corresponding elastic reaction force. Under the action of this elastic reaction force, the limiting component abuts against the heating film positioned on the side of the battery module facing the first opening, thus ensuring that the heating film is stably fixed and tightly adhered to the surface of the battery module. At the same time, the elastic limiting component can effectively buffer dimensional errors or positional deviations during the assembly process, avoiding deformation or damage to the heating film due to excessive local pressure caused by rigid contact, thereby protecting the structural integrity of the heating film and improving the safety and service life of the heating system.

[0011] In one feasible approach, the limiting element is a thermally insulated limiting element.

[0012] By employing a heat-insulating limiting component between the battery module and the power module, heat transfer from the heating film to the power module is effectively blocked, preventing damage to the circuit board due to overheating. Simultaneously, this heat-insulating design also prevents the power module's casing from overheating, improving user safety and preventing burns. Furthermore, by reducing heat loss to non-target areas, the heat generated by the heating film is more concentrated on the battery module, reducing unnecessary heat loss and thus improving the heating efficiency and energy utilization rate of the heating film.

[0013] In one possible implementation, the orthographic projection of the limiting member on the target plane lies within the orthographic projection of the heating film on the target plane, which is the plane containing the surface of the battery module facing the first opening.

[0014] Since the orthographic projection of the limiting component is completely contained within the orthographic projection range of the heating film, it not only achieves precise positioning of the heating film and improves the bonding quality between the heating film and the surface of the battery module, ensuring the continuity and efficiency of the heat conduction path; at the same time, it also avoids unnecessary interference of the limiting component to other non-heated areas or surrounding structures of the battery module, improving assembly accuracy and structural safety.

[0015] In one possible implementation, a limiting member is disposed on the side of the power module facing the battery module, the limiting member having at least one hollow area, and the side of the power module facing the battery module having at least one protruding structure, each protruding structure extending into the corresponding hollow area.

[0016] By inserting the protruding structure into the hollowed-out area on the limiting component, the space required by the high-performance electronic components is effectively avoided, while the remaining area of ​​the limiting component can still apply uniform pressure to the heating film, ensuring reliable adhesion. Furthermore, the cooperation between the hollowed-out area and the protruding structure also plays an auxiliary positioning role, helping to improve the assembly accuracy between the power module and the limiting component, reducing the risk of misalignment, and increasing production efficiency.

[0017] In one possible implementation, the battery pack includes multiple limiting members, each of which is a strip structure, and the multiple limiting members are arranged in a row along a first direction and / or a second direction, the first direction and the second direction intersect, and are all parallel to the plane of the surface of the battery module facing the first opening.

[0018] In one possible implementation, the power module includes a heat sink, a circuit board, and a baffle. The heat sink has an accommodating space and a second opening communicating with the accommodating space. The circuit board is located within the accommodating space. The baffle is connected to the heat sink and covers the second opening. A limiting member is connected to the side of the baffle facing the battery module.

[0019] By placing the circuit board within the heat sink's accommodating space and sealing the second opening with a baffle, effective protection of the circuit board is achieved, while the heat sink itself provides heat dissipation, improving module integration and heat dissipation efficiency. The compact structure also facilitates miniaturized battery pack design. Once the power module is installed and fixed in the first opening of the housing, the limiting component abuts against the heating film positioned on the side of the battery module facing the first opening. This structure allows the heating film to be pre-pressed and fixed by the limiting component during assembly, reducing reliance on adhesives and ensuring reliable positioning. Even under high-temperature conditions, where the adhesive connecting the heating film and battery module may soften or lose bonding strength, the limiting component can still continuously apply pressure to prevent the heating film from loosening or falling off, effectively maintaining a tight fit between it and the battery module and ensuring stable heat transfer efficiency. This prevents safety accidents such as dry burning, ignition of auxiliary materials, and short circuits caused by burning insulation materials.

[0020] In one possible implementation, the battery pack also includes an adhesive layer located between the limiting member and the baffle, with the limiting member connected to the baffle via the adhesive layer.

[0021] By setting an adhesive layer between the limiting component and the baffle, not only is the limiting component reliably fixed, ensuring that it will not fall off during long-term operation, but the adhesive layer can also play a role in vibration reduction and buffering, effectively mitigating mechanical vibration and preventing the limiting component from applying uneven pressure to the heating film due to rigid contact, thereby further improving the bonding stability between the heating film and the battery module.

[0022] In one possible implementation, the battery pack also includes a fire suppression module, which is located on the inner wall of the enclosure and above the battery modules. The fire suppression module contains fire extinguishing agents and is used to spray the fire extinguishing agents onto the battery modules when the temperature of the battery modules is greater than or equal to a temperature threshold.

[0023] By placing the fire suppression module above the battery module, it is not only beneficial to ensure that the fire suppression module is directly above the cell pressure relief valve when the battery cell in the battery module goes out of control, thus improving trigger sensitivity and response speed; at the same time, the sprayed fire extinguishing agent can quickly cover and cool the ignition point, effectively control the initial fire, and prevent the thermal runaway from spreading.

[0024] Secondly, this application provides a storage device including a plurality of battery packs as described above, wherein the plurality of battery packs are stacked.

[0025] Multiple battery packs are stacked to form a modular, high-density energy storage unit, which can flexibly configure the system capacity according to actual power demand. Attached Figure Description

[0026] Figure 1This is a schematic diagram of the framework structure of a photovoltaic system provided in an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the structure of a battery pack provided in an embodiment of this application;

[0028] Figure 3 yes Figure 2 An exploded view of a battery pack is shown.

[0029] Figure 4 This is an exploded view of a power module provided in an embodiment of this application;

[0030] Figure 5 This is an assembly diagram of a power module and a limiting component provided in an embodiment of this application;

[0031] Figure 6 yes Figure 2 An exploded view of another battery pack is shown.

[0032] Figure label:

[0033] 110 - Photovoltaic array; 120 - Power converter; 130 - Power grid; 140 - External load; 150 - Energy storage device;

[0034] 1-Battery pack; 100-Casing; 200-Battery module; 201-Heating film; 300-Power module; 301-Heat sink; 302-Circuit board;

[0035] 3021 - Electronic components; 303 - Baffle; 400 - Limiting components; 500 - Fire protection module; P - Hollowed-out area; Q - Protruding structure; C - Receiving cavity;

[0036] K1 - First opening; M - Accommodation space; K2 - Second opening; X - First direction; Y - Second direction. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them.

[0038] In this application, the terms "first," "second," etc., are used only to distinguish different technical features or components, and do not indicate any priority or importance among these features, nor do they imply the number of technical features involved. Therefore, technical features described with "first," "second," etc., should be understood to include one or more.

[0039] In this application, unless otherwise expressly stated and limited, "multiple" means two or more.

[0040] Furthermore, in this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0041] In the accompanying drawings of the embodiments of this application, in order to clearly express different structural elements, solid structures such as parts and components are represented by guide lines, openings and holes are represented by broken lines, and hollow structures such as spaces and cavities are identified by guide lines with arrows.

[0042] This application provides an energy storage device that stores electrical energy using a specific medium and releases it when needed, achieving efficient energy utilization. As a flexible power regulation unit, this energy storage device can be used as a load regulator or backup power source, and is widely applied in various scenarios such as household electricity, industrial and commercial parks, large-scale ground power plants, and integrated photovoltaic and energy storage systems.

[0043] Figure 1 This diagram illustrates a framework structure of a photovoltaic system, such as... Figure 1 As shown, the photovoltaic system includes a photovoltaic array 110, a power converter 120, an energy storage device 150, and a power grid 130 / external load 140. The power converter 120 integrates a DC / DC conversion circuit and a DC / AC conversion circuit. The energy storage device 150 can be located between the DC / DC conversion circuit and the DC / AC conversion circuit. The electrical energy generated by the photovoltaic array 110 is boosted or bucked by the DC / DC conversion circuit to charge the energy storage device 150. When the electrical energy generated by the photovoltaic array 110 is insufficient to supply power to the power grid 130 / external load 140, the electrical energy stored in the energy storage device 150 can be transferred to the power grid 130 / external load 140 via the DC / AC conversion circuit within the power converter 120. Conversely, the energy storage device 150 can also receive power from the power grid 130. The AC power output from the power grid 130 is converted to DC power by the DC / AC conversion circuit and then transmitted to the energy storage device 150, thus charging the energy storage device 150. Alternatively, the power converter 120 may only include a DC / AC conversion circuit, while the energy storage device 150 may have a built-in DC / DC conversion circuit, and the energy storage device 150 may directly receive the DC power generated by the photovoltaic array 110.

[0044] In some embodiments, the energy storage device 150 may include multiple battery packs stacked together to form a modular, high-density energy storage unit.

[0045] For a clearer illustration of the battery pack structure, please refer to [link / reference]. Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of a battery pack provided in an embodiment of this application. Figure 3 yes Figure 2 An exploded view of a battery pack is shown. The battery pack 1 includes a housing 100 and a battery module 200. The housing 100 has a receiving cavity C and a first opening K1 communicating with the receiving cavity C. The battery module 200 is disposed in the receiving cavity C via the first opening K1, and the housing 100 provides effective fixation and protection for the battery module 200.

[0046] In some embodiments, such as Figure 2 and Figure 3 As shown, the battery pack 1 may also include a power module 300, which is disposed at the first opening K1, and at least partially located outside the receiving cavity C, for sealing the opening. This not only achieves the integration of the power module 300, but also helps to improve the sealing and structural integrity of the housing 100. Simultaneously, the power module 300 is also electrically connected to the battery module 200 to realize the regulation and output of electrical energy.

[0047] In actual operation, the battery module 200 can only achieve the highest charging and discharging efficiency within a specific operating temperature range. When the ambient temperature is low, the chemical reaction rate inside the battery module 200 slows down, resulting in a decrease in charging and discharging efficiency, which in turn reduces the actual usable capacity of the battery pack 1.

[0048] To address the issue of reduced charging and discharging efficiency at low temperatures, such as... Figure 3 As shown, the battery pack 1 in this embodiment further includes a heating film 201. The heating film 201 is disposed on the side of the battery module 200 facing the first opening K1 and can be bonded to the surface of the battery module 200 with an adhesive to heat the battery module 200 in a low-temperature environment, ensuring that the operating temperature of the battery module 200 is within its optimal range. For example, the heating film 201 can be one or more composite structures selected from silicone, polyimide, or positive temperature coefficient materials.

[0049] However, the adhesive is prone to melting under high temperature conditions, which can cause the heating film to fail to stay in place or even fall off.

[0050] To address the above problems, this application proposes an improvement solution: such as Figure 3 As shown, the battery pack 1 also includes a limiting member 400, which is located between the battery module 200 and the power module 300. The limiting member 400 is connected to the power module 300 and abuts against the heating film 201.

[0051] The term "limiting component 400" is a general term for structures with limiting functions. Their specific shape, material, quantity, and arrangement can be selected according to actual needs. The following will describe various optional implementation methods.

[0052] In this embodiment, by providing a limiting member 400 on the side of the power module 300 facing the battery module 200 and connecting the limiting member 400 to the power module 300, after the power module 300 is positioned and fixed in the first opening K1 of the housing 100, the limiting member 400 can abut against the heating film 201 positioned on the side of the battery module 200 facing the first opening K1, that is, the limiting member 400 and the heating film 201 are interference-fitted. This structure allows the heating film 201 to be pre-pressed and fixed during assembly, eliminating the need to rely entirely on adhesives for positioning and connection. In this way, even under high-temperature conditions, where the adhesive connecting the heating film 201 and the battery module 200 melts, the limiting member 400 can still continuously apply pressure to the heating film 201 through its abutting action, preventing the heating film 201 from falling off. This effectively maintains the adhesion and heat conduction efficiency between the heating film 201 and the battery module 200, avoiding safety accidents such as dry burning of the heating film 201, ignition of auxiliary materials, and damage to insulation materials leading to short circuits. Furthermore, because the heating film 201 is reliably fixed, it ensures that the battery module 200 can heat up quickly and uniformly in low-temperature environments, maintaining its operation within its optimal operating temperature range. Within this temperature range, the electrochemical reaction rate inside the battery module 200 accelerates, and the charging and discharging efficiency is significantly improved, thereby increasing the actual usable capacity of the battery module 200. Simultaneously, the stably fixed heating film 201 also helps maintain the stability of the internal temperature and humidity environment of the battery pack 1, reducing the risk of condensation on the surface of electronic components in the battery pack 1, avoiding circuit failures such as short circuits, and significantly improving the overall safety of the battery pack 1.

[0053] In some embodiments, the limiting member 400 in the battery pack 1 is an elastic limiting member 400.

[0054] After the power module 300 is disposed and fixed in the first opening K1 of the housing 100, the limiting member 400 can undergo elastic deformation, thereby generating a corresponding elastic reaction force. Under the action of this elastic reaction force, the limiting member 400 abuts against the heating film 201 disposed on the side of the battery module 200 facing the first opening K1, thereby ensuring that the heating film 201 is stably fixed and tightly attached to the surface of the battery module 200. At the same time, the elastic limiting member 400 can effectively buffer dimensional errors or positional deviations during the assembly process, avoiding deformation or damage to the heating film 201 due to excessive local pressure caused by rigid contact, thereby protecting the structural integrity of the heating film 201 and improving the safety and service life of the heating system.

[0055] Figure 4This is an exploded view of a power module provided in an embodiment of this application. Figure 4 As shown, the power module 300 in the battery pack 1 includes a heat sink 301, a circuit board 302, and a baffle 303. The heat sink 301 has an accommodating space M and a second opening K2 communicating with the accommodating space M. The circuit board 302 is located within the accommodating space M. The baffle 303 is connected to the heat sink 301 and covers the second opening K2.

[0056] By placing the circuit board 302 within the accommodating space M of the heat sink 301 and sealing the second opening K2 with the baffle 303, not only is the circuit board 302 effectively protected, but the heat sink 301 itself is also used to dissipate heat, improving the integration and heat dissipation efficiency of the module. At the same time, the structure is compact, which is conducive to the miniaturization design of the battery pack 1.

[0057] In some embodiments, the limiting member 400 in the battery pack 1 is connected to the side of the baffle 303 facing the battery module 200. For example, the limiting member 400 is disposed on the surface of the baffle 303 facing the battery module 200 and is fixedly connected to the baffle 303.

[0058] Thus, after the power module 300 is installed and fixed in the first opening K1 of the housing 100, the limiting member 400 can abut against the heating film 201 located on the side of the battery module 200 facing the first opening K1. This structure allows the heating film 201 to be pre-pressed and fixed by the limiting member 400 during assembly, thereby reducing reliance on adhesives and achieving reliable positioning. Even under high-temperature conditions, where the adhesive connecting the heating film 201 and the battery module 200 may soften or its bonding performance decreases, the limiting member 400 can still prevent the heating film 201 from loosening or falling off by continuously applying pressure, effectively maintaining a tight fit between it and the battery module 200 and ensuring the stability of heat conduction efficiency. This prevents safety accidents such as dry burning, ignition of auxiliary materials, and short circuits caused by burning insulation materials.

[0059] In some embodiments, the battery pack 1 further includes an adhesive layer (not shown) located between the limiting member 400 and the baffle 303, the limiting member 400 being connected to the baffle 303 via the adhesive layer.

[0060] By setting an adhesive layer between the limiting member 400 and the baffle 303, not only is the limiting member 400 reliably fixed, ensuring that it will not fall off during long-term operation, but the adhesive layer can also play a role in vibration reduction and buffering, effectively alleviating mechanical vibration and preventing the limiting member 400 from applying uneven pressure to the heating film 201 due to rigid contact, thereby further improving the bonding stability between the heating film 201 and the battery module 200.

[0061] In this embodiment, the limiting member 400 in the battery pack 1 is a heat-insulating limiting member 400.

[0062] For example, the heat insulation limiting member 400 can be made of materials with good heat insulation properties, such as silicone foam or high-temperature resistant foam.

[0063] In related technologies, although the battery module 200 can be heated by setting a heating film 201 to improve the performance of the battery module 200 in low-temperature environments, the heat generated by the heating film 201 will spread to the surroundings, affecting the adjacent power module 300, especially the circuit board 302 in the power module 300, causing the circuit board 302 to rise abnormally, thereby affecting the system reliability and service life.

[0064] In this embodiment, by employing a heat-insulating limiting member 400 between the battery module 200 and the power module 300, heat transfer from the heating film 201 to the power module 300 is effectively blocked, preventing damage to the circuit board 302 due to overheating. Simultaneously, this heat-insulating design also prevents the casing of the power module 300 from overheating, improving user safety and preventing burns. Furthermore, by reducing heat loss to non-target areas, the heat generated by the heating film 201 is more concentrated on the battery module 200, reducing unnecessary heat loss and thus improving the heating efficiency and energy utilization rate of the heating film 201.

[0065] In some embodiments, the orthographic projection of the limiting member 400 on the target plane is located within the orthographic projection of the heating film 201 on the target plane, which is the plane on which the surface of the battery module 200 faces the first opening K1.

[0066] Since the orthographic projection of the limiting component 400 is completely contained within the orthographic projection range of the heating film 201, it not only achieves precise positioning of the heating film 201 and improves the bonding quality between the heating film 201 and the surface of the battery module 200, ensuring the continuity and efficiency of the heat conduction path; at the same time, it also avoids unnecessary interference of the limiting component 400 to other non-heated areas or surrounding structures of the battery module 200, thereby improving assembly accuracy and structural safety.

[0067] In this embodiment, the shape and structure of the limiting member 400 can have various design forms, as long as it can ensure that after the power module 300 is disposed in the first opening K1 of the housing 100 and fixed, the limiting member 400 can abut against the heating film 201 disposed on the side of the battery module 200 facing the first opening K1. For clarity, this embodiment will illustrate various optional implementation methods as examples:

[0068] The first optional implementation method, combined with Figure 3 and Figure 4The limiting member 400 has a plate-like structure and is disposed on the side of the power module 300 facing the battery module 200. The limiting member 400 has at least one hollow area P, and the side of the power module 300 facing the battery module 200 has at least one protruding structure Q. Each protruding structure Q extends into a corresponding hollow area P, thereby achieving positioning and structural avoidance between the limiting member 400 and the power module 300. Here, the limiting member 400 can be silicone foam or heat-resistant foam.

[0069] For example, the protruding structure Q is located on the baffle 303 in the power module 300. Figure 4 As shown, the circuit board 302 in the power module 300 integrates various electronic devices 3021, some of which are inductors, capacitors, relays, or IGBT modules, and some of these devices are quite tall. To ensure that these tall electronic devices 3021 can be properly arranged and that the power module 300 can be tightly installed at the first opening K1 of the housing 100, a protruding structure Q is provided on the side of the baffle 303 facing the battery module 200. This protruding structure Q has a cavity on the side facing the circuit board 302 to accommodate these tall electronic devices 3021, thereby creating local space avoidance.

[0070] By inserting the protruding structure Q into the hollowed-out area P on the limiting member 400, the space required for the high-performance electronic device 3021 is effectively avoided, while the remaining area of ​​the limiting member 400 can still apply uniform pressure to the heating film 201, ensuring reliable adhesion. Furthermore, the cooperation between the hollowed-out area P and the protruding structure Q also plays an auxiliary positioning role, helping to improve the assembly accuracy between the power module 300 and the limiting member 400, reducing the risk of misalignment, and increasing production efficiency.

[0071] For the second optional implementation method, please refer to... Figure 5 , Figure 5 This is an assembly diagram of a power module and a limiting member provided in an embodiment of this application. Figure 5 As shown, the battery pack 1 may include multiple limiting members 400, each limiting member 400 having a strip-like structure, and the multiple limiting members 400 are arranged in a row along a first direction X and / or a second direction Y. The first direction X and the second direction Y intersect, and are both parallel to the plane containing the surface of the battery module 200 facing the first opening K1. For example, the first direction X is perpendicular to the second direction Y.

[0072] Here, under this implementation, the limit component 400 can be arranged in three ways:

[0073] Type 1: Multiple limiting components 400 are arranged in a row only in the first direction X, and are not distributed in the second direction Y.

[0074] The second type: multiple limiting components 400 are arranged in a row only in the second direction Y, and there is no distribution in the first direction X.

[0075] The third type: multiple limiting components 400 are arranged simultaneously along the first direction X and the second direction Y, and are distributed in both directions, for example, in a matrix or array layout.

[0076] For example, the limiting member 400 here can be a strip structure made of silicone material. Of course, it can also be other structures, as long as it can ensure the fixation of the heating film 201. This application does not make specific limitations and can be flexibly selected according to actual application needs.

[0077] The two implementation methods described above can be used individually or simultaneously in combination with specific requirements. When used simultaneously, the plate-shaped limiting member 400 in the first implementation ensures precise assembly between the power module 300 and the heating film 201 and effectively avoids the space requirements of the high-performance electronic device 3021. Meanwhile, the multiple strip-shaped limiting members 400 in the second implementation further enhance the fixing effect and uniform force distribution of the heating film 201. This combination not only improves the stability and reliability of the overall structure but also provides additional support and positioning functions in different directions, thereby optimizing the overall performance and assembly efficiency of the battery pack 1.

[0078] Figure 6 yes Figure 2 An exploded view of another battery pack is shown. (See diagram below.) Figure 6 As shown, the battery pack 1 also includes a fire suppression module 500, which is bolted or snap-fitted onto the inner wall of the housing 100 and located above the battery module 200. The fire suppression module 500 contains fire extinguishing agent and is used to spray the fire extinguishing agent onto the battery module 200 when the temperature of the battery module 200 is greater than or equal to a temperature threshold.

[0079] For example, the extinguishing agent within the fire-fighting module 500 can be a highly efficient extinguishing medium such as perfluorohexanone, heptafluoropropane, aerosol, or fine water mist. These extinguishing agents are characterized by rapid cooling, good electrical insulation, and no residue, making them suitable for battery fire scenarios.

[0080] By placing the fire-fighting module 500 above the battery module 200, it not only ensures that the fire-fighting module 500 is directly above the cell pressure relief valve when the battery cell in the battery module 200 runs out of control, thus improving trigger sensitivity and response speed, but also, due to the interference fit between the limiting member 400 and the heating film 201, most of the extinguishing agent remains above the battery module 200, allowing the sprayed extinguishing agent to quickly cover and cool the ignition point, effectively controlling the initial fire, preventing thermal runaway spread, and increasing the reliability of fire extinguishing.

[0081] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0082] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, include: Housing, battery module, power module, and limiting components: The box has a receiving cavity and a first opening communicating with the receiving cavity; The battery module is disposed in the receiving cavity, and a heating film is disposed on the side of the battery module facing the first opening; The power module is disposed in the first opening and is electrically connected to the battery module; The limiting member is located between the battery module and the power module, the limiting member is connected to the power module, and abuts against the heating film.

2. The battery pack according to claim 1, characterized in that, The limiting component is an elastic limiting component.

3. The battery pack according to claim 1, characterized in that, The limiting component is a heat-insulating limiting component.

4. The battery pack according to any one of claims 1-3, characterized in that, The orthographic projection of the limiting member on the target plane is located within the orthographic projection of the heating film on the target plane, and the target plane is the plane containing the surface of the battery module facing the first opening.

5. The battery pack according to any one of claims 1-4, characterized in that, The limiting member is disposed on the side of the power module facing the battery module. The limiting member has at least one hollow area. The side of the power module facing the battery module has at least one protruding structure, and each protruding structure extends into the corresponding hollow area.

6. The battery pack according to any one of claims 1-4, characterized in that, The battery pack includes multiple limiting members, each of which is a strip structure, and the multiple limiting members are arranged in a row along a first direction and / or a second direction. The first direction and the second direction intersect, and both are parallel to the plane of the surface of the battery module facing the first opening.

7. The battery pack according to any one of claims 1-6, characterized in that, The power module includes a heat sink, a circuit board, and a baffle. The heat sink has an accommodating space and a second opening communicating with the accommodating space. The circuit board is located within the accommodating space. The baffle is connected to the heat sink and covers the second opening. The limiting member is connected to the side of the baffle facing the battery module.

8. The battery pack according to claim 7, characterized in that, The battery pack also includes an adhesive layer located between the limiting member and the baffle, the limiting member being connected to the baffle through the adhesive layer.

9. The battery pack according to any one of claims 1-8, characterized in that, The battery pack also includes a fire suppression module, which is disposed on the inner wall of the enclosure and located above the battery module. The fire suppression module contains a fire extinguishing agent and is used to spray the fire extinguishing agent onto the battery module when the temperature of the battery module is greater than or equal to a temperature threshold.

10. An energy storage device, characterized in that, It includes multiple battery packs as described in any one of claims 1-9, wherein the multiple battery packs are stacked.

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